Furnace.



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Patented Oct. 29, 1918.

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Patented Oct. 22), 1918.

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JOHN E. BELL, OF BROOKLYN, NEW YORK.

FURNACE.

Specification of Letters Patent.

Patented Oct. 29, 1918.

Application filed January 17, 1917. Serial No. 142,787.

To all whom it may concern.

Be it known that I, J I IN E. BELL, a citizen of the United States, and resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New ork, have invented certain new and useful Ini- .provements in Furnaces, of which the following is a specification.

This invention relates to furnaces for steam boilers, having reference more especially to furnaces which are designed for the; burning of small size anthracite coal.

coke breeze, and similar fuel that burn slowly and with a comparatively low fuel bed temperature. As such fuel, when it is thrown on the fire, i nites slowly from underneath, it is desira is to promote the ignition of the fuel by exposing it to radiated heat from hot fire brick surfaces located over the fire, which surfaces absorb heat both by contact with the products of combustion and by radiation from the fuel bed. The ideal condition, therefore, to attain the maximum temperature of the furnace would be to surround the grate completely with fire brick but as an outlet for the products of combu tion must be provided, such condition cannot be practically attained.

It is the object of my invention to provide a furnace having a fire-brick arch combining the elements of simplicity, strength and durability and being of such characteristic construction that the efficient radiation and reradiation of the heat between the arch and the fuel bed are eii'cctcd, yet permitting the products of combustion to escape and uniformly to enter the boiler heating space throughout the width of the furnace.

In the preferred form or forms of my invention herein illustrated the front part of the furnace grate is spanned by an arch which is sprung from side to side of the setting, at or adjacent the front wall of the structure, .and the rear of the grate is covered, in part, by an arch that is sprung from the bridge wall to the front wall and is provided with spaced openings Which afford an exit for the gases of combustion across the width of the furnace. This arch is substantially stayed, and the stays are so arranged that they are protected from the intense heat of the .furnace.

The invention also comprises features of construction which will be hereinafter described and claimed.

In the drawings Figure l is a longitudinal vertical sectio of a boiler and setting equipped with a furnace arch construction embodying the principle of my invention.

F igs. 2 and 3 are transverse vertical sections, as on the lines 22 and 3-3 respectively of Fig. 1.

Fig. 4 is a perspective view of the stay devices for the furnace arch.

Fig. 5 is a longitudinal vertical section of a slight modification of the arch construction.

Fig. 6 is a transverse section, as on the line (3-6 of Fig. 5.

Referring to the drawings 10 designates the side walls of the setting; 11 the front wall; 12 the back Wall; 13 the bridge Wall; 1% the top, and 15 the grate; all these parts being of any usual or approved construction, excepting as hereinafter particularly pointed out.

16 designates a boiler of any suitable ty that illustrated comprising the headers 5 tubes 18, and drums 19, supported upon the setting as usual.

In the construction shown the front part of the grate is covered by a transverse arch 20 which is sprung from side to side of the furnace, and the rear of the grate is covered,

in part, by an arch 21 which is sprung fron the bridge wall to the front wall of the structure. The latter arch, 21, comprises a series of arch sections which are spaced apart to afford Outlets whereby the products of combustion from the fuel bed are n rn1itted to escape to the boiler heating surface throughout the Width of the furnace.

The rear end of the sectional arch structure is arranged relatively near to the grate and the body of the structure is arched 11pwardly to the front wall of the furnace and above the front arch, thereby substantially SUPPOllLlIlP the sectional structure in a position wherein it is effectually subjected to the action of the intense heat of the hot gases and burning fuel, and at the same time insuring the el'licicnt irradiation of the heat from the arch to the fuel in order to promote the ignition cf the latter as above mentioned. This divided arch structure is set-urely held in position by a substantial stay and tie-rod system which is protected from the action of the intense heat: of the furnace. In the present instance one of the stays is constituted by an I-beam 23 which is located upon the front wall of the furnace, directly in advance of the arch structure 21, and is supported at its ends by VBIlJICEIl I-beams 24 exteriorly of the sides of the setting. Another stay comprises preferably a pipe 25 (to afiord an air duct) which is confined within the bridge Wall, directly in the rear of said arch structure. These stay members 23, 25 extend transversely of the furnace and project at their ends beyond the side walls of the setting, the corresponding extremities of the respect ve members being tied together by steel rods 26 which are conveniently located in alley ways on the outside of the setting.

My improved arch structure, instead of being made up of spaced arch sections as above described, may be composed of a single structure having a series of spaced openings 22 formed therein as illustrated Figs. 5 and and still be Within the scope of my invention as defined in the appended claims.

I claim 1. A furnace having a grate, a front wall, a bridge wall, an arch sprung from the bridge Wall to the front wall, transverse stays supported by the bridge and front walls respectively, and tie rods connecting the ends of the said bridge and front stays exteriorly of the furnace.

2. A furnace having a grate, a front wall, a bridge wall, an arch sprung from the bridge wall to the front Wall, a transverse stay member supported upon the exterior of the front wall, a transverse stay member I comprising a series of spaced sections sprung from the bridge wall. ad acent the grate, to the front-wall above the front arch, transverse stays supported by the bridge and front walls, respectively, and tie-rods connecting the ends of the said stays cxleriorly of the 7 side walls.

Signed at New York in the county and State of New York this 15th day of January, A. D. 1917. 

